Fritz hundeshagen



(No Model.)

4 [NVENTOR W1 TNESSES:

I Af/of'ney m: NORFUS PETERS ca. PHQ'IO-UTHO" WAsHmGT UNITED STATESPATENT OFFICE.

FRITZ HUNDESHAGEN, OF MULHEIM-ON-THE-RHINE, GERMANY.

BALL GRINDING-MILL...

$PEGIFIOATION forming part of Letters Patent No. 688,018, dated December3, 1901.

' Application filed August 6, 1901. Serial No. 71,033 (No model.)

T0 at whom it may concern.-

Be it known that I, FRITZ HUNDESHAGEN, a citizen of Saxony-Weimar,residing at Mulheim-on-the-Rhine, Germany, have invented certain new anduseful Improvements in Ball Grinding-Mills; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same. I

The present invention relates to grist-mills wherein the material to beground is comminuted by the action of a number of balls arranged withina drum, the said material being subjected to the attrition between theballs and the walls of thedrum.

The object of the present invention is to provide means whereby thematerial to be ground is gradually fed forward from the supply end ofthe drum to the point of delivery and to make such feed regulatable andconsistent with simplicity of construction. Such a feed of the materialhas hitherto been effected by inclining the axis of the drum of themill, and the velocity of the feed was governed by the difference ofheight between the two ends of the drum or, in other words, the inclineof thesame.

Under the present invention the feed is effected and regulated withoutresorting to any inclination of the drum; but thetravel of the materialis brought about by providing the interior. of the periphery of the drumwith suitable inclined grooves or gutters, said inclined grooves beingarranged in zones, which Zones extend the length of the drum. Betweeneach zone or inclined groove is preferably arranged an annular groove ortrough. By this arrangement the-material in process of grinding iscaused to fall out of the inclined or annular grooves, where the latterare employed, and as the walls of the drum rise above the level of thecontents of said drums the material in each inclined groove tends toslide forward to thedelivery end of the drum, and so that a portion ofthe same will reach a position in the said drum, where it willsubsequently be taken up by the grooves in the next zone, and so on.

Other features of the invention will be set forth hereinafter.

In the accompanying drawings, Figure 1 represents a verticallongitudinal section of a ball grinding-mill embodying my invention;Fig. 2, a transverse section of the same; and Fig. 3 a view ofthe innerperiphery of the drum of said mill, developed or spread out into aplane.

By referring to the drawings it will be noted that the ball-millembodying my invention. comprises a drum A, horizontally journaled, asshown, said drum being filled to the proper level with thegrinding-balls a, the material to be ground being fed into the drumthrough the upper or feed end B and delivered from the mill at the pointof discharge C. At the feed and delivery end the said drum is', providedwith the helical con.- veyers b' and 'o of the shown construction andarranged in the feed and delivery throats B and O.

The parts thus far described are well known in the art; but my inventionconsists in the arrangement now to be described.

As seen by reference to the drawings, the inner periphery of the drum Ais divided into a series of zones 1 which zones start at verticalannular grooves or troughs (1. Between these annular grooves d arearranged the inclined grooves or channels d, the number of inclinedgrooves or channels d in each zone being governed by the speed withwhich it is desired to feed forward the grist material. In order toadjust the amount of feed, it is preferred to provide a number ofinclined grooves cl, corresponding to the greatest amount of feed.Whenit is desired to reduce the speed, a number of these inclinedgrooves are closed up or obliterated by se curing in them strips orplugs e, as shown in Fig. 1, whichstrips may be held in place in anysuitable manner. In order to retard the amount of feed, particularly atthe delivery end of the drum, a number of grooves or channelsdflinclined oppositely to the inclined grooves 01, may be arranged inthe zones D, as shown in Fig. 3. v

The mode of operation of a ball-mill constructed in accordance with theabove is as follows: The portion of the material undergoing the grindingprocess occupies the grooves 61, d, and 61 while these grooves areintheir lowermost position. Shortly after the lower end of such grooves dand d emerges above the level of the contents of the mill the ma,-

terial in the annular grooves cl belowsuch lower end drops back into thedrum, whereupon the material in the inclined grooves 01' and d slidesdown the respective grooves into the vacant space thus created and formsheaps, I 'where it is discharged from the respective grooves,asiindicated in Figs. 1 and 2.

Since the contents of the inclined grooves are derived from the materialwhich is included within the respective zone to which said inclinedgrooves belong, between two annular grooves cl and d, which bound suchzone, and

- is continually deposited atthe boundary-line of said zones, thepropelled grist material consequently viscaused to move forward by thewidth of a. zone on an average,'and for the grooves (1' such movement isalways toward the delivery end. Since this operation is continuallyrepeated, the entire contents of the mill are gradually fed forward,while at the same time its comminution progresses and the parts aresubjected to the most intimate com minglin g. As stated above, this feedmay be somewhat retarded by the inclined grooves 02 A further regulationis effected by the mil cerns. The principle underlying the presentinvention,however, enables me to provide a mill which can be adaptablefor large or for I inexpensive mannerwith reference to the quantity andthe fineness of the product.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is

1. In a ball-mill, a drum, provided on its interior periphery with aseries of zones of incliued grooves or channels for feeding the grist.material.

2. In a grist-mill, adrum, provided on its interior periphery with aseries of annular grooves in combinationwith inclined grooves, arrangedWithin and communicating with the annular grooves.

' 3. In a grist-mill, a drum, provided on its interiorperiphery with aseries of inclined grooves in combination with removable blocks or bars,arranged to be secured in the said grooves.

4. In a ball-mill, a drum, provided on its interior periphery withinclined grooves for feeding the material forward, in combination withgrooves inclined in an opposite direction, for retarding the feed.

In testimony whereof I affix my signature in presence of two witnesses.

FRITZ I-IUNDESI-IAGEN.

Witnesses:

CHARLES LE SIMPLE, CARL SoHMI'rT.

